Biogas made from meadow grass affords a 100% cyclical economy and a sustainable future perspective for the small structured greens that are increasing not being cultivated. During trial operation 2005/2006 the demonstration facility in this project showed the potential of grass by producing 240,000 m³ of biogas out of 40 ha of green space. According to relevant prognoses, 100,000 ha of green space will be available in Austria for energy use. This implies a potential of more than 450 million m³ of biogas, amounting to the energy consumption of 200,000 households.